July 22 (Hfrance.fr) - The US Centers for Disease Control and Prevention has not revised its masking guidelines, even as the infectious Delta variant of COVID-19 continues to sweep the US UnitedUS is increasing the number of cases, CDC director Rochelle Walensky said during a press appeal Thursday. Walensky a declined to say if the CDC is considering changing the guidelines. The 7-day average of new cases in the US is up 53%, said Walensky said during the call. The Delta variant, which was first found in India, now accounts for over 80% of new cases nationwide and has been detected in over 90 countries. Carl's report O 'Donnell, edited by Franklin Paul Our standards: Thomson Hfrance.fr's principles of trust.